Casing cutter



Aug. 30, 1932.

Original Filed April 18. 1927 kwuuui \vm E. BROTHERTON ET AL 'CASING CUTTER 2 Sheets-Sheet l w/ATWAQ Patented Aug. 30, 1932 "JWEDFSTATES Josnrnn BROTHERTON' AND nANx'I'Nw. nonnxsfor nousron;rnxnsnssrerions 0F I a onannrrmo J. s. nnnncnomam, or HARRIS COUNTY, Tunas ArPi eat immed ril 1 1927, serial No. 184,542; Renew-(5 mm, 1930.

This; invention relates to new and useful improvements in a casing cutter,

One objectof. he invention is to provide a cutter of the character-described, specially designed for cuttingfipipe, or casing, particularly pipe or casing stuck in a wellbore;

Another object ofthe invention is to provide a casing cutterof the character described; including means operable by fluid pressure for forcing the? cutting blades into cutting relation with the pipe or casing to be cut and embodying also means forstoppingithe flow of pressure fluid through the cutter, and thereby indicating, through the action of thepump, or other source'of pressure that the pipe has been severed.

-With the above and other objects in view thisinvention has particular relation to certain;novel features of construction, operation and arrangement of parts, anexample of which is given in this specification and illustrated; in; the, accompanying drawings,

wherein Figure 1 shows a vertical sectional viewof the cutter. a

Figure 2 shows a cross. sectional view thereof, taken on the line2 2 of Figure 1,

a Figure 3' shows a fragmentary sectional View of a modified form of the cutter.

jFigure 4 shows a vertical sectional View of said modifiedform.

Referring now more particularly to the drawings wherein likenumerals of reference designate similar parts in each of the figures, thenumeral 1 designates the barrel or cylinder which is attached to the lower end of the operating string of pipe 2. Threaded into,

.andclosing the lowerrend of the, cylinder there 'is a guide point 3 having the outlet ports 4. i I

Within the cylinder there is a plunger 5 having acentral port 6 threaded into which is the upper end ofthe depending tubular stem 7 and threaded onto the lower end of stem and located in the cylinder there is a blade carrier fits snugly I cylinder. The lower end of the blade carrier carries a, valve seat; 9 and the carrieraan'd seat having an axial restricted water channel 1O therethrough whose lower; 'endpiszf isaligned underneath thechannelf 10 and which conforms tothe shapeiofand is designed toseat in-thel"fiared lower 'end thereof to' block said channel. The wallsfof the cylinder. l have-the downwardly] and outwardly diverging blade guidewaysw 13 a cut therethrough w: ally-ziloping guide faces 14.; 1

Cutter blades 15 arepivotally connected, at tb i'ih 1' upper ends, to the carrier 8 and their lower ends are outwardly curved and these blades are, alignedwith and'adapted to work throughthe guideways .13 and theirouter whose lowerends form the out ends have sharp cutting points whichjar'e,

aligned around the carrier; ,7; v

In use the cutter is lowered into thepipe, or casing, to be cut to the desired point. vThe guide point serves not o'nlytoguide the, cut:

but also to removeany obstructing material reached fluid under; pressure is: 'forced 'down 8 down with it; and the outwardlycurved blades 15 will engage the-guide facesand lower ends'of the blades'swith their guides 14 upstanding pins 16 are' anchored to thecarthe inner sidesof thelower ends of the-blades so as to hold said ends out far :fin ugh to engage the guide faces 14 when the carrier downwardly. The cuttergis they 1 is forced ter intotheupper end of said pipe orcasing,

therein When the desiredlpoin't has been through the: stem 2: and this will force the plunger downwardly" carryingg the .;carr ier '85 'rier 8 with their upper ends engaging against a move on downwardly and the seat 9 will seat on the valve 12, which valve will close the lower end of the channel 10 and block said channel. The'outlet of the pressure fluid being thus closed the pump will stop thus indicating to theoperator that the pipe, or;

casing has been severed;

The valve 12 may bev adjusted up or down, as the pipe or casing, to be cut varies inthi'ckness, and so that the channel 10 will notbe prematurely closed before the pipe has been i severed.

Within the cylinder 1 above the carrier there is a fixed spring seat 17, and supported on thisseat there is 'a coil spring 18 which surrounds the stem 7 I and supports the plunger 5. i w i I v h When the'pipe, or casing, has been severed, and the pressure of the fluid in the stem2 relieved the spring 18 will elevate the'plung-er 5 and withdraw the cutter blades '15 within the cylinder 1 and the cutter may then be withdrawn. I

Threaded onto the cylinder lbeneaththe guideways 13 there'is a collar 19. This collar may be adjusted upwardly to bring its upper end opposite the lower ends-of the guides 1 1' and said upper end will accentuate the outward deflection of the' bla'des 1-5, as they are-forced outwardly into working relation with the pipe, or. casing, to be cut, or said collar may be adjusted downward- "ly-so that theblades willclear its upper end shown in Figure 3. The upper and lower and in such position it will not influence the operation of said blades. I v

1 In F-gures 3 and 1 we have shown a slight ly modified form of the cutter wherein the {cylinder 1 is. slightly reduced beneath the guides 14: and the lower end of the cutter carrier 8 is correspondingly reduced. This -will insure the engagement of the blades 15 with the guide face 14, as the plunger is low ered and dispenses with the necessity of using the-pins 16.

When the cutter is used for cutting pipe or casing of very large inside diameter it "is necessary to reinforce or support the blades 15 on-the outside of the cylinder 1 and in such case the reinforcing sleeve may befitted over the cylinder 1 and secured thereto in any desired manner, as by'means of pins 21, as

ends of this sleeve 20 are tapered to prevent the cutter from hanging on an inside projection that may be in the'pipeto' be cut and the sleeve-'20 is provided with guide ways,

as 22, adapted to register with the guide ways 7 13 when the sleeve 20 is secured on the cylinder and through which the cutting blades 15 may project when the cutter is at work. In other respects the form shown'in Figure 3 is substantially similar in construction and method of operation as the form shown in] Figures 1 and 2. I

What we claim is: 1. A casing cutter including a cylinder having guideways through the wall thereof, a fluid operated plunger .in the cylinder, a blade carrier in the cylinder beneath theplunger and connected thereto, a reinforcing sleeve of substantial thickness around the cylinder" having tapered ends and having guideways which register with the cylinder guideways and blades connected to said carrier and adapted'to work through said guide-- which register with'the cylinder guideways and whose end is tapered and blades cone nected to said carrier-and'adapted to work through said guide ways and secured by said guideways. I I 1 c 23. A casing cutter including a icylinder having guide ways through the wallsthereof, a carrier fitted within said cylinder, cutting blades on said carrier registering withthe said guideways, means to advance said blades through said guideways, and a sleeve on the outside of said cylinder having a tapering lower end forming a guide and also having guide means for said bladesregistering with said guideways for the purpose set'forth.

j 4. A casing cutter including a body hav- "ing guideways through the walls thereof, a

blade carrier in said body, arcuate cutting blades on said carrier, means to advance said blades throughsaid guideways, and a detach able sleeve on the outside of said body having cutter guiding meansthereon, said sleeve act'- ing to increase the outer diameter of said body to reinforce said blades when the blades are in cutting position. i '1 I 5.. A: casing cutter including a body having guideways through the walls thereof, a blade carrier insai-d body, cutting blades on said carrier, means to advance said blades in' said guideways, and detach-able downwardly tapering means to increase-the outer diameter of said body and co-operate with said guideways to support said cutters when the cutters are advanced to cutting position.

6;. A cutter for casing and the like including a'body,abladecarrier in said body, a

substantially 'ar'cuate cutting blade on said carrierfs'aid body having an outwardly thickened portion which tapers downwardly to form a guide, and which has a guide way, for the blade, therethrough, and means to advance the blade through said guideway.

7. A cutter for cutting casing in a well bore including a body, a blade carrier therein, a cutting blade on the carrier, said body having an outwardly thickened portion which reinforces the blade when the latter is advanced and which tapers downwardly to form a guide and which has a guideway for the blade therethrough and means to advance the blade through said guideway.

In testimony whereof we have signed'our names to this specification. V

JOSEPH E. BROTHERTON. RANKIN W; MORRIS.

(IERTIFIGATE 0F GORREGTIGN.

Patent No. 1,874,880. August 30, 1932.

JOSEPH E. BRDTHERTON and RANKIN W. MORRIS.

It is hereby certified that the above numbered patent was erroneously issued to the inventors, said "Brotherton and Morris", and one-half interest to "J. S. Abercrombie, of Harris County, Texas", whereas said patent should have been issued to the inventors, said Brotherton and Morris, as owners of the entire interest in said invention; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 22nd day of November, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

